I have plenty of anecdotal evidence from people from MidEast and Pakistan who used to visit US almost every year but no longer do so. At one conference in Malaysia one Saudi delegate told me he had come earlier to Malaysia for his honeymoon. Previously he used to visit the Us regularly. His words were "if we go the US now we are treated as criminals, but when we come to Malaysia we are welcomed".
Perhaps these are the types of tourists that teh US authorities no longer wish to entertain, but they are high spending and more than welcomed in many places in the far east. In places like Malaysia and Singapore they can enjoy the same comforts as the US (and cheap shopping).